Use the data given below to construct a Born-Haber cycle to determine the lattice energy of CaO. A) -3414 kJ B) +1397 kJ C)-2667 kJ D) +3028 kJ

Answer:

centrifugation

Explanation:

Answer:

translation: Write the electronic configuration of 2 metallic elements.

Answer:

(See explanation)

Explanation:

Copper: [Ar] 3d¹⁰ 4s¹

Silver: [Kr] 4d¹⁰ 5s¹

To determine whether a precipitate form or not, we need to check if there is a possible formation of an insoluble compound when the two reactants mix together. Here's the classification for each reaction:

Reaction 1: NaNO3 + NaOH

This reaction involves sodium nitrate (NaNO3) and sodium hydroxide (NaOH).

When we mix sodium nitrate (NaNO3) and sodium hydroxide (NaOH), they will undergo a double displacement reaction.

NaNO3(aq) + NaOH(aq) → NaOH(aq) + NaNO3(aq)

In this reaction, no precipitate forms because both sodium nitrate (NaNO3) and sodium hydroxide (NaOH) are highly soluble in water and dissociate completely.

Reaction 2: AgNO3 + NaBr

This reaction involves silver nitrate (AgNO3) and sodium bromide (NaBr).

When we mix silver nitrate (AgNO3) and sodium bromide (NaBr), they will undergo a double displacement reaction.

AgNO3(aq) + NaBr(aq) → AgBr(s) + NaNO3(aq)

In this reaction, a precipitate forms because silver bromide (AgBr) is insoluble in water and will precipitate out. Sodium nitrate (NaNO3) remains in the solution because it is highly soluble.

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Answer:

1. Amine.

2. Alcohol.

3. Carboxylic Acid.

4. Halocarbon.

Explanation:

The correct answer according to the tile are Amine, Alcohol, Carboxylic acid, Halocarbon.

How can hydrocarbons be classified based on their structure?

Hydrocarbons can be classified as either aromatic or aliphatic compounds, depending on the presence of a benzene ring.

What is the most common classification of hydrocarbons?

Alkanes are hydrocarbons in which all of the bonds are single bonds. Alkenes are hydrocarbons that contain a carbon-carbon double bond.

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To draw the alkenes cis-1,2-dichloroethene, trans-1,2-dichloroethene, and 1,1-dichloroethene, we need to understand the concept of alkenes and their structural formulas.

Alkenes are unsaturated hydrocarbons that contain a carbon-carbon double bond. The general formula for an alkene is CnH2n. In this case, we are dealing with alkenes that contain chlorine atoms.

Let's start by drawing cis-1,2-dichloroethene. In this compound, the two chlorine atoms are on the same side of the double bond. The structural formula can be represented as follows:

```
   Cl
    |
H3C=C(Cl)
```

Now, let's move on to trans-1,2-dichloroethene. In this compound, the two chlorine atoms are on opposite sides of the double bond. The structural formula can be represented as follows:

```
   Cl     Cl
    |     |
H3C=C=CH2
```

Lastly, let's draw 1,1-dichloroethene. In this compound, there is only one carbon atom, and both hydrogen atoms are replaced by chlorine atoms. The structural formula can be represented as follows:

```
   Cl     Cl
    |     |
   C=C
```

In these structural formulas, each line represents a single bond, and each corner and end of a line represents a carbon atom. Hydrogen atoms are not explicitly shown, but we assume that each carbon atom is bonded to the appropriate number of hydrogen atoms to satisfy the valence requirements.

It's important to note that these structural formulas represent a 2D representation of the compounds. In reality, molecules are three-dimensional, and the spatial arrangement of atoms can affect the properties and reactivity of the compound. Additionally, there can be different ways to draw the same compound while maintaining the same connectivity of atoms. However, the structural formulas provided above are the most common representations for these alkenes.

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Removal of the loosely bounded electron is defined by the ionization energy. Chlorine needs less energy to add electrons and has higher ionization power. Thus, option A is correct.

The ability of an electron to accept or give electrons to another element in a chemical reaction by forming and creating bonds and the positive and negative charges has been defined by the ionization energy.

Magnesium has lower ionization energy than chlorine due to its large size and smaller nuclear charge. On the other hand, chlorine can easily add electrons to the valence shell which is almost full.

Therefore, option A. chlorine has higher ionization energy and can add electrons with minimum energy.

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Answer:

Hydochloric acid

HCl

Explanation:

Hydrochloric acid is an acid and ionizes to form hydrogen and chloride ions.

The name of the compound that gives hydrogen ion and chloride ions in the solution state is Hydrochloric acid.

Hydrochloric acid is made up of one atom of hydrogen and 1 atom of chlorine. We can also say, it is made up of 1 mole of hydrogen and 1 mole of chlorine.

 The formula of this compound is HCl;

 In solution:

               HCl\(_{aq}\)    →   H⁺    +    Cl⁻  

34%  is the percent by mass of nitrogen in the following fertilizers. It represents the amount of solute contained in a mass m of solution.

The mass percent might be used to denote a degree. Furthermore, it defines the element during a certain mixing. The solution mixture is frequently defined in terms of mass percentage.

It represents the amount of solute contained in a mass m of solution. The quantity of solutes can be stated in terms of mass or moles. We will study the mass percent formula using numerous solved numerical examples in this post.

molar mass of nitrogen = 28g

molar mass of urea= 60.06

mass percentage =(28/  60.06)×100 = 34%

Therefore, 34% is the percent by mass of nitrogen in the following fertilizers.

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A molecule's three-dimensional structure, with simple lines representing plane links, wedge-shaped lines representing bonds facing the observer, and dashed lines representing bonds Stereochemistry facing the viewer's opposite.

Stereochemistry is the study of a molecule's three-dimensional structure. The only structural difference between cis and trans isomers, which are types of stereoisomers, is where the molecule's elements are located three dimensionally. The chemical and physical properties of these stereoisomers may differ. Stereochemistry is a branch of chemistry concerned with "the study of the various spatial configurations of atoms in molecules." The systematic presentation of a specific area of science and technology, known as

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ANSWER

Water molecule is a compound

EXPLANATION;

Water molecule is formed from the combination of oxygen and hydrogen atoms

Recall, that compound is the combination of two or more elements that are chemically combined together

Therefore, water molecule is a compound

Answer:

Molecularity is the number of ions or molecules that take part in the rate determining step

Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change

The reaction has not yet started, and the time required for 16.8% of the reactant to remain cannot be calculated using the given rate constant.

Given,The rate constant for this first-order reaction is 0.0830 s−1 at 400 ∘C.A⟶products After how many seconds will 16.8% of the reactant remain-The time taken for a first-order reaction to reach a particular percentage of completion can be calculated using the following formula:t = (ln(A/A₀))/kwhere A₀ is the initial concentration of the reactant, A is the concentration of the reactant at a given time, k is the rate constant, and t is the time elapsed since the reaction began.In this question, we are given the rate constant, k = 0.0830 s−1 at 400 ∘C, and we want to find out the time required for 16.8% of the reactant to remain.Let's assume that the initial concentration of the reactant is 100 units (we can assume any value as it does not affect the percentage of completion).Therefore, the concentration of the reactant remaining after 16.8% of completion would be: A = 16.8 units.Substituting these values in the above formula, we get:t = (ln(16.8/100))/0.0830t = (−1.7918)/0.0830t = −21.58 sThis time value is negative, which means that the reaction has not even started yet. Therefore, we need to check the given percentage of completion.

If it is less than 50%, we can assume that the reaction has not yet started. In this case, the percentage of completion is 16.8%, which is less than 50%.

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The ratio of the hydrogen masses in the compounds is 2: 3(Option A).

We know that compounds are composed of atoms and that compounds are formed by the combination of atoms. According to the atomic theory, the combination of the atoms with each other to form compounds occurs in a definite ratio.

From the law of multiple proportions, if two elements combine in such a way that they could lead to the formation of more than one type of compound, the combination occurs in such a way that masses of the second element that combines with first element are in simple ratios.

We can see from the statements in the complete question that the ratio of the hydrogen masses in the compounds is 2: 3(Option A).

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Answer: broooo what is this

Explanation:

A reaction between an acid and a base describes a neutralization reaction. Therefore, option (a) is correct.

A neutralization reaction can be described as a chemical reaction in which an acid and base react with each other to produce salt and water.

The acidic strength of the reactant gives the pH of the neutralized solution. When a strong acid solution will react with a strong base the formed salt can be neither acidic nor basic, it will be neutral. For example, when HCl (a strong acid) reacts with NaOH (a strong base), the resulting salt is sodium chloride (NaCl) and water.

HCl    +    NaOH   →   NaCl   +   H₂O

When a strong acid solution will react with a weak base, then the formed salt will be acidic in nature. When a strong base solution will react with a weak acid then the formed salt will be basic in nature and decides the pH level of the solution.

Therefore, the reaction between the acid and base can best describe a neutralization reaction.

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Answer:

b because the detective ate coffee all day

The differences between the molecules NO and N₂O are their chemical formulas, molecular structures, and chemical properties. NO is a diatomic molecule composed of one nitrogen and one oxygen atom, while N₂O is a triatomic molecule composed of two nitrogen atoms and one oxygen atom.

The molecule with the formula NO is a diatomic molecule composed of one nitrogen atom and one oxygen atom. It is a free radical gas that is highly reactive and plays a role in a number of chemical reactions in the atmosphere, such as the formation of acid rain. The bond between the nitrogen and oxygen atoms is a covalent bond, and the molecule has a linear geometry.

The molecule with the formula N₂O, on the other hand, is a linear triatomic molecule composed of two nitrogen atoms and one oxygen atom. The bond between the nitrogen and oxygen atoms in N₂O is also a covalent bond, but it is a polar covalent bond due to the electronegativity difference between nitrogen and oxygen. As a result, N₂O is a greenhouse gas and contributes to global warming.

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Answer:

1) international unit of mass is N

  international unit of weight is kg

Explanation:

1) Mass of the ball is 10N

  Weight of the ball is 100kg  { 10×(Ball's weight) }

Answer:

The dirty dozen.

Explanation:

This is mainly seen in the control of hazardous waste and its regulations through treaty in the control of persistent organic pollutant(POPs). This regulation is seen to occur in 12 widely used persistent organic pollutants; these are seen to have the ability to absorb and store tissues that make them fatty especially in humans and also animals found in the higher trophic levels or in the food web. That being said, it can be noted that the dirty dozen can move or even attain hundreds, or thousands of levels towards the environ and also in other cases, transporting them through air or water as the case may be.

True, both the alcohol and HX undergo a chemical change during the conversion of alcohol to alkyl halide.

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Human devices use potential energy to store energy, whereas kinetic energy is potential energy in motion. Both types of energies can be measured in Joules (J).

Human devices generate and use different sources of energy, which can be classified into renewable sources (e.g., solar, hydraulic, winds, etc) and non-renewable sources (e.g., nuclear energy) of energy.

For example, a hydroelectric power plant transforms the potential energy stored in water reservoirs (e.g., a lake) into mechanical energy (a type of kinetic energy) when this energy is released from the water reservoir and flows through a turbine.

Subsequently, this type of kinetic energy is then used to generate electricity.

On the other hand, a nuclear power plant uses the potential energy that is stored within the nuclei of atoms to produce kinetic energy by a process known as nuclear fission.

This process (nuclear fission) releases energy in the form of heat (i.e., thermal energy).

Subsequently, this type of kinetic energy (heat) is used to generate steam, which then moves turbines to generate mechanical energy and finally generates electricity.

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The density of the fish tank of rob having 50 cm length, 25 cm height and a width of 20 cm and mass of 3000 g is 0.12 g/cm³ or 1.2 x 10⁻¹ g/cm³.

What is density?

Density of a substance is the mass of substance divided by its volume. It is denoted by a Greek symbol is ρ. It is given by,

                                               ρ = m

                                                      v

where,

ρ = density of substance

m = mass of substance

v = volume of substance

Given data :

Mass = 3000 g

length = 50 cm

width = 20 cm

height = 25 cm

volume = length x width x height

volume = (50 x 20 x 25) cm³ = 25000 cm³

Substituting values in the formula,

Density =  Mass  

                Volume

Density =   3000 g  

                25000 cm³

Density = 0.12 g/cm³ or 1.2 x 10⁻¹ g/cm³

Therefore, the density of the fish tank which rob had is 0.12 g/cm³ or 1.2 x 10⁻¹ g/cm³.

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Answer:

Test tube :)

Explanation:

Im pretty shure its D- graduated cylendar

A flask holds much more than that a test tube doesnt have mesure meants (i dont tink so at least?) and a beaker also much more and is harder to explain..

Answer:

they are only efficient in certain areas

Explanation:

Wind turbine are efficient only in certain areas it is a problem with using wind turbines to produce energy.

Wind turbine convert the wind energy into the electricity. It is a power generating device that converts the kinetic energy in to electrical energy.

Now lets check all option one by one:

Option (A): Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

So, it is correct option.

Option (B): Wind turbines occupy a lot of space to work.

So, it is incorrect option.

Option (C): Wind turbines produce a large amount of energy is not a problem.

So, it is incorrect option.

Option (D): Wind turbines does not create a pollution or it does not pollute the air or water.

So, it is incorrect option.

Thus, we can say that Wind turbines are efficient only in certain areas it is a problem with using wind turbines to produce energy because the flow of air from areas of high pressure towards the lower pressure.

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A radioactive substance decreases by 65% each hour. Find the hourly decay factor. The hourly decay factor is 0.35.

Chemicals in the class of radionuclides (also known as radioactive materials) have unstable atomic nuclei. They become stable by undergoing modifications in the nucleus (spontaneous fission, alpha particle emission, neutron conversion to protons, or the opposite).

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made.

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Answer:

1.05 liters

Explanation:

Just multiply:

5 * 21%

Simplify:

5 * 0.21

Multiply it out:

1.05 liters

~~~Harsha~~~

Answer:

In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.

In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.

That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.

Conclusion: 20 degree change represents a larger change in Celsius scale.

Explanation:

In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.

In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.

That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.

Conclusion: 20 degree change represents a larger change in Celsius scale.